(UNESP) Uma pessoa está parada numa calçada plana e horizontal diante de um espelho plano vertical E pendurado na fachada de uma loja. A figura representa a visão de cima da região.
Olhando para o espelho, a pessoa pode ver a imagem de um motociclista e de sua motocicleta que passam pela rua com velocidade constante V = 0,8 m/s, em uma trajetória retilínea paralela à calçada, conforme indica a linha tracejada. Considerando que o ponto O na figura represente a posição dos olhos da pessoa parada na calçada, é correto afirmar que ela poderá ver a imagem por inteiro do motociclista e de sua motocicleta refletida no espelho durante um intervalo de tempo, em segundos, igual a
Questões relacionadas
- Matemática | 14.4 Cilindro
Um piscicultor cria uma espécie de peixe em um tanque cilíndrico. Devido às características dessa espécie, o tanque deve ter, exatamente, 2 metros de profundidade e ser dimensionado de forma a comportar 5 peixes para cada metro cúbico de água. Atualmente, o tanque comporta um total de 750 peixes. O piscicultor deseja aumentar a capacidade do tanque para que ele comporte 900 peixes, mas sem alterar a sua profundidade. Considere 3 como aproximação para π.
O aumento da medida do raio do tanque, em metro, deve ser de
- Matemática - Fundamental | 11. Áreas e Volumes
Analise a figura abaixo, em que as medidas são todas em centímetros, para resolver a questão.
A área desse octógono pode ser dada por:
- Língua Inglesa | 2.07 Conjunções
(AFA) THE RELATIONSHIP BETWEEN FRIENDS AND TYPES OF FRIENDSHIP
Everyone has at least one best friend, some maybe even more. There are also those people who are just friends and also arch-enemies. People may think that just because they are your friends it means that they are your best friend. The thing is, even though they are your friend, the relationship between a best friend and a friend is different. Either way regardless of archenemies, friends or best friends, there are not many ways to compare any of these different types of friends, but you can easily contrast them from one another.
Arch-enemies often know more about each other than two friends. In a comparison of personal relationships, 1friendship is considered to be closer than association, although a wide range of degrees of intimacy exists in friendships, arch-enemies, and associations. Friendship and association can be thought of as spanning across the same continuum. 2The study of friendship is included in the fields of sociology, social psychology, anthropology, philosophy, and zoology. Even animals have familiars! Various academic theories of friendship have been proposed, among which are social exchange theory, equity theory, relational dialectics, and attachment styles. 3In Russia, one typically bestows very few people the status of “friend”.
These friendships, however, make up in intensity what they lack in number. Friends are entitled to call each other by their first names alone, and to use diminutives. A customary example of polite behavior is addressing "acquaintances" by full first name plus their patronymic. These could include relationships which elsewhere would be qualified as real friendships, such as workplace relationships of long standing, or neighbors with whom one shares an occasional meal or a social drink with.
Also in the Middle East and Central Asia, male friendships, while less restricted than in Russia, tend to be reserved and respectable in nature. They may use nicknames and diminutive forms of their first names. In countries like India, it is believed in some parts that friendship is a form of respect, not born out of fear or superiority. Friends are people who are equal in most standards, but still respect each other regardless of their attributes or shortcomings. Most of the countries previously mentioned (Russia, Asia, and even the Middle East) and even our own nation are suffering a decline in genuine friendships.
According to a study documented in the June 2006 issue of the Journal American Sociological Review, Americans are thought to be suffering a loss in the quality and quantity of close friendships since at least 1985. The study’s results state that twenty-five percent of 4Americans have no close confidants, and the average total number of confidants per citizen has dropped from four to two. According to the study, 5Americans' dependence on family as a safety net went up from fifty-seven percent to eighty percent; Americans dependence on a partner or spouse went up from five percent to nine percent.
Recent studies have found a link between fewer friendships, especially in quality, and psychological and physiological regression. In the sequence of the emotional development of the individual, friendships come after parental bonding and before the pair bonding engaged in at the approach of maturity. In the intervening period between the end of early childhood and the onset of full adulthood, friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships experienced later in life.
6Unfortunately, making friends seems to trouble many of people. Having no friends can be emotionally damaging for all ages, from young children to full grown adults. A study performed by researchers from Purdue University found that post-secondary-education friendships, college and university last longer than the friendships before it. Children with Asperger syndrome and autism usually have some difficulty forming friendships. 7Socially crippling conditions like these are just one way that the social world is so difficult to thrive in. 8This does not mean that they are not able to form friendships, however. With time, moderation and proper instruction, they are able to form friendships after realizing their own strengths and weaknesses.
9There is a number of theories that attempt to explain the link, including that; Good friends encourage their friends to lead more healthy lifestyles; 10Good friends encourage their friends to seek help and access services, when needed; 11Good friends enhance their friend’s 12coping skills in dealing with illness and other health problems; and/or Good friends actually affect physiological pathways that are protective of health. Regardless of what we think, we can clearly see that there are some ways that friends, best friends and archenemies are the same, but in the end they are clearly more different. 13Nonetheless we all have every single type in our lives.
(Adapted from: http://www.ukessays.com/essays/philosophy/therelationship- between-friends-and-types-of-friendship-philosophyessay. php)
“This does not mean that they are not able to form friendships, however” (reference 8). The option that replaces the highlighted expression is
- Língua Inglesa | 1.3 Modelo de Questão: Enem x Tradicional
BOGOF
is used as a noun as in ‘There are some great bogofs on at the supermarket’ or an adjective, usually with a word such as ‘offer’ or ‘deal’ — ‘there are some great bogof offers in store’.
When you combine the first letters of the words in a phrase or the name of an organisation, you have an acronym. Acronyms are spoken as a word so NATO (North Atlantic Treaty Organisation) is not pronounced N-A-T-O. We say NATO. Bogof, when said out loud, is quite comical for a native speaker, as it sounds like an insult, ‘Bog off!’ meaning go away, leave me alone, slightly childish and a little old-fashioned.
BOGOF is the best-known of the supermarket marketing strategies. The concept was first imported from the USA during the 1970s recession, when food prices were very high. It came back into fashion in the late 1990s, led by big supermarket chains trying to gain a competitive advantage over each other. Consumers were attracted by the idea that they could get something for nothing. Who could possibly say ‘no’?
Disponível em: www.bbc.co.uk. Acesso em: 2 ago. 2012 (adaptado).
Considerando-se as informações do texto, a expressão “bogof” é usada para:
- Física | 2.7 Impulso e Quantidade de Movimento
Em qualquer obra de construção civil é fundamental a utilização de equipamentos de proteção individual, tal como capacetes. Por exemplo, a queda livre de um tijolo de massa 2,5 kg de uma altura de 5 m, cujo impacto contra um capacete pode durar até 0,5 s, resulta em uma força impulsiva média maior do que o peso do tijolo. Suponha que a aceleração gravitacional seja 10 m s-2 e que o efeito de resistência do ar seja desprezível.
A força impulsiva média gerada por esse impacto equivale ao peso de quantos tijolos iguais?